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TDA1557

2 x 22 W BTL stereo car radio power amplifier with speaker protection

Philips Electronics 

Philips Semiconductors

2 x 22 W BTL stereo car radio power

amplifier with speaker protection

Product specification

TDA1557Q

PINNING

SYMBOL

INP1

GND1

VP1

OUT1A

GND

OUT1B

OUT2A

GND

OUT2B

VP2

M/SS

Vref

INP2

PIN

DESCRIPTION

1 input 1

2 ground (signal)

3 supply voltage 1

4 output 1A

5 power ground 1

6 output 1B

7 output 2A

8 power ground 2

9 output 2B

10 supply voltage 2

11 mute/stand-by switch

12 input reference voltage

13 input 2

FUNCTIONAL DESCRIPTION

The TDA1557Q contains two identical amplifiers with

differential input stages, and can be used for bridge

applications. The gain of each amplifier is fixed at 46 dB.

Special features of this device are:

a. mute/stand-by switch

low stand-by current

low mute/stand-by switching current (low cost supply

switch)

mute facility

b. loudspeaker protection

when a short circuit to ground is made, which forces a

DC voltage of ≥ 1 V across the loudspeaker, a built-in

protection circuit becomes active and limits the DC

voltage across the loudspeaker to ≤ 1 V

c. the harmonic distortion at low frequencies can be

decreased by connecting two diodes to ground at pin 12.

handbook, halfpage

INP1 1

GND1 2

VP1 3

OUT1A 4

GND 5

OUT1B 6

OUT2A 7 TDA1557Q

GND 8

OUT2B 9

VP2 10

M / SS 11

Vref 12

INP2 13

MCD322 - 1

Fig.2 Pin configuration.

May 1992

4

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